Improved apparatus foe sifting- coal



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IMPROVED APPARATUS FOR SIETING GOAL.

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TO ALL WHOM IT MAY CONOERN:

Be it known that I, SAMUEL LANGMAID, of Lawrence, in the county of Essex, and State of? Massachusetts, have invented certain new and useful improvements in the Apparatus which is used for sifting or Screening Coal, or other substances, of which the followingl is a, full, clear, and exact description, reference being had to the accompanying drawings, making part of' this4 specification, inwhieh- Figure 1 is a `vertical central section, and

FigureQ a front elevation after a portion of' the said front has been removed.

In my said invention the upper or receiving and tilting-boxA is pivoted or hinged near its top, and near the front side 'of the casel which contains the siftingv or screening apparatus, by a screw or pin, 7c, which passes through the end B of the case and enters the substance of thc box A, or by a suitable hinge. Theupper screen C isarranged a short distanceabove the bottom D of thev box A, and a gate, E, which slides freely up or down, forms the rea-r side of said hoX. crank-shaft, F, passing through the case from right to left, has two cams G secured thereto, just` inside of the case and under the ends of the box A. And in some cases a spring, z, is fastened to the under side of the box to arrestthc sudden drop or action of said box upon. the cams when in operation. Beneath the crank-sl1ai`t I arrange an inclined screen, H, highest at the rear side oi' the ease, directly under the crank-shaft and cams, and beneath this inclined screen is adraw, O, or other receptacle for ashes or other fine refuse matter, which may pass through the screen H.- I

The coal or other substance tovbe sii'ted or screened is placed in the tilting-box A, and the cover K of the ease is closed to prevent escape of fine dust in that direction. Motion is given to the cams by turning the crank L. The horns in these rotating cams come in Contact with the bottom ofthe box A, or the springs thereon, 4causing the rear side of the box to rise by contact of each of the horns, While the Weight of the substance in the box and under operation forces the box down as each of the horns passes the point of action. The ashes or other fine waste matter passes through the screen C into a compartment, M, beneath, and by the action of the tiltingbox works its n'ay'out at the rear sideg, (which is open,) and falls on tothe-inclined screen H, and most o? it passes through'said screen into the receptacle below. After the ashes or other tine trashy or waste matter has been disposed of, the gate E is raised by the knob or handlef, and rod e, when, by continuing the sifting operation, the coal or other substance which has been sifted or screened will work its way cut at the rear side of the tiltingbox under the gate, and fall on to the inclined screen H, whereit will tumble or slide forward and'pass out through the front opening or spout l? into any-convenient coal-scuttle or other article placed there toreceive it. The tilting-box A is slightly inclined, and highest at the front side, to facilitate the discharge of the ashes and the sifted `coal at the rear. -The upper screen may be coarser or have larger meshes than the lower screen, so as to allow some of the ne pieces of coa-l to pass through, and work out, and fall on to the lower screen, where they will pass down the incline and out at the spout P, thereby facilitating the sifting operation, and dividing the work more evenly betwecn'the two screens. y

I contemplate theuse of perforated sheet metal or slat Work in lieu of the wire screens, and in some instances these slats or perforated metal lscreens may answer a good purpose when Wire screens are not easily` obtained.

What I claim as new, and desire to secure by Letters Patent, is y The pivotedtiltin-g-box A, constructed substantially as shown and described, in combination with the gate E, crank-shaft F, cams G, and inclined screen H, with orwithout the springs h, the whole arranged to operate substantially as and for the purpose set forth. 1

sAML LANGMAID.

Witnesses:

S. F. Germs, A JOHN E. CRANE. 

